science

Some dairy farmers want to increase the amount of milk produced by their cows. How can the farmers use selective breeding to increase milk production?

By limiting the number of offspring per cow

By allowing the cows to select their mates

By breeding cows that are high milk producers

By increasing the age of the cows that are bred


Organisms with desirable traits can be produced through selective breeding and natural selection. Decide whether the examples on the right are examples of traits produced through selective breeding or natural selection.
Selective Breeding



Natural Selection


What is one difference between natural selection and selective breeding?

With natural selection, the genetic makeup of an organism is different than it's parents. With selective breeding the genetic makeup is identical to its' parent.

Once a trait helps a species survive, the time it takes for that trait to become apart of the population is much faster with natural selection.

Traits developed through natural selection are influenced by pressures from the environment. Organisms that are produced through selective breeding have traits selected by humans that may or may not be related to environmental pressures.

Natural selection can only occur when organisms are chosen and produce offspring. Selective breeding allows organisms to select a mate who is the best adapted to its' environment.


Selective breeding is an effective way to produce organisms that have desirable traits. After several generations of selective breeding, an organism can be produced consistently with certain traits. The disadvantage to the offspring can be

they may be unable to reproduce.

offspring from one organism that is selectively bred cannot breed with another organism.

they are not as genetically diverse as organisms who were not selectively bred.

they produce less offspring.

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    Ms. Sue
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